The large quark mass expansion of Γ( Z 0 → hadrons ) and Γ( τ − → ν τ + hadrons ) in the order α 3 s
The large quark mass expansion of Γ( Z 0 → hadrons ) and Γ( τ − → ν τ + hadrons ) in the order α 3 s
复制标题
Г( Z 0 → 强子 ) 和 Г( τ − → ν τ + 强子 ) 的大夸克质量膨胀量级为 α 3 s
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
J. Vermaseren
中科院分区：
文献类型：
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作者：
S. A. Larin;T. V. Ritbergen;J. Vermaseren
给出了Z0衰变率为强子的解析α-3-S修正.我们计算了大顶夸克质量膨胀的(包括)数量级(m2Z/m2 top)3项的修正。我们依赖于单个费曼图的大质量展开技术，并详细讨论了它的应用。我们将6flAvour QCD的结果转化为具有fiVve ActiveflAvour的对偶理论中的结果，验证了QCD耦合常数之间的解耦关系。我们还得到了τ轻子衰减率在α3 S近似下的大魅力夸克质量展开式。
We present the analytical α 3 s correction to the Z 0 decay rate into hadrons. We calculate this correction up to (and including) terms of the order ( m 2 Z /m 2 top ) 3 in the large top quark mass expansion. We rely on the technique of the large mass expansion of individual Feynman diagrams and treat its application in detail. We convert the obtained results of six flavour QCD to the results in the effective theory with five active flavours, checking the decoupling relation of the QCD coupling constant. We also derive the large charm quark mass expansion of the semihadronic τ lepton decay rate in the α 3 s approximation.